<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./style.css" />
    <title>Document</title>
    <style>
      * {
        box-sizing: border-box;
      }

      body {
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
        margin: 0;
      }
      .container {
        display: flex;
        width: 90vw;
      }
      .panle {
        background-size: auto, 100%;
        background-position: center;
        background-repeat: no-repeat;
        border-radius: 50px;
        color: #fff;
        flex: 0.5;
        cursor: pointer;
        height: 80vh;
        position: relative;
        margin: 10px;
        transition: flex 0.7s cubic-bezier(0.05, 0.6, 0.4, 0.9);
      }
      .panle h3 {
        font-size: 24px;
        opacity: 0;
        position: absolute;
        bottom: 20px;
        left: 20px;
        margin: 0;
        transition: opacity 0s ease-in 0s;
      }
      .panle.active {
        flex: 5;
      }
      .panle.active h3 {
        opacity: 1;
        transition: opacity 0.3s ease-in 0.4s;
      }
      @media (max-width: 500px) {
        .container {
          width: 100vw;
        }
        .panle:nth-of-type(4) {
          display: none;
        }
        .panle:nth-of-type(5) {
          display: none;
        }
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="panle" style="background-image: url(./img/img1.jpg);">
        <h3>海阔天空</h3>
      </div>
      <div class="panle" style="background-image: url(./img/img2.jpg);">
        <h3>蓝天白云</h3>
      </div>
      <div class="panle" style="background-image: url(./img/img3.jpg);">
        <h3>山川湖海</h3>
      </div>
      <div class="panle" style="background-image: url(./img/img4.jpg);">
        <h3>星空灿烂</h3>
      </div>
      <div class="panle" style="background-image: url(./img/img5.jpg);">
        <h3>绿树成荫</h3>
      </div>
    </div>

    <script>
      const penles = document.querySelectorAll(".panle");
      penles.forEach((panle) => {
        panle.addEventListener("click", () => {
          removeClass();
          panle.classList.add("active");
        });
        function removeClass() {
          penles.forEach((penle) => {
            penle.classList.remove("active");
          });
        }
      });
    </script>
  </body>
</html>
